焊接工艺参数对仰焊MAG堆焊成形的影响  

Effects of welding parameters on formation of overhead position MAG surfacing

作　　者：李晨阳 许燕[1] 周建平[1] 李静[1] Li Chenyang;Xu Yan;Zhou Jianping;Li Jing(Xinjiang University,Urumqi 830000,China)

机构地区：[1]新疆大学,乌鲁木齐830000

出　　处：《焊接》2023年第3期32-38,共7页Welding & Joining

基　　金：国家自然科学基金资助项目(51765063);机器人及智能装备技术科技创新团队(2022D14002)。

摘　　要：以ER50-6碳钢焊丝作为堆焊焊丝,在Q235B基板上进行仰焊MAG堆焊试验。通过单因素法研究了送丝速度、焊接速度和焊丝伸出长度3个主要焊接工艺参数对仰焊单道焊缝熔宽和余高的影响,分析了不同焊接工艺参数下焊缝出现驼峰缺陷的原因。基于此,对仰焊单道多层堆焊提出了堆焊策略,即减小热输入、减少熔池冷却时间和熔池扰动。在此基础上,进行了仰焊单道多层连续堆焊10层成形,并进行了拉伸测试。结果表明,在送丝速度3.5 m/min、焊接速度0.25 m/min、焊丝伸出长度6 mm的焊接工艺参数下,成形质量相对稳定,抗拉强度达到518 MPa,能满足一些对精度要求不高的零件的使用要求,验证了所提出的仰焊单道多层堆焊策略的可行性,为仰焊堆焊成形零件焊接工艺参数的选择提供了参考。ER50-6 carbon steel welding wire was chosen as surfacing welding wire to carry out overhead position MAG surfacing test on Q235B substrate.Effects of three main welding parameters,wire feeding speed,welding speed and wire extension,on weld width and reinforcement of single pass overhead weld was studied by single factor method.Causes of hump defects in welds under different welding parameters were analyzed.Based on this,surfacing strategy for single pass multi-layer overhead position surfacing was proposed,namely reducing heat input,cooling time and disturbance of molten pool.On this basis,10 layers of single pass multi-layer continuous overhead position surfacing were formed,and tensile test was carried out.The results showed that under welding parameters of wire feeding speed 3.5 m/min,welding speed 0.25 m/min and wire extension 6 mm,forming quality was relatively stable and tensile strength reached 518 MPa,which could meet requirements of some parts with low accuracy requirements.Feasibility of the proposed single pass multi-layer overhead position surfacing strategy was verified,which provided a reference for the selection of welding parameters of overhead position surfacing forming parts.

关 键 词：仰焊 焊接工艺参数 成形 单道多层焊 

分 类 号：TG455[金属学及工艺—焊接]